package day2017119;

public class A {

        void f(){
        {System.out.println("I am A");}
    }
    class  B{
        }
}
    class Hello
    {
        public static void main(String args[])
        {
            System.out.println("你好，很高兴学习JAVA");
            A a=new A();
            a.f();
        }
    }


